BPX4SIA (sigaction) example

The following code sets new action for SIGALRM to default processing and returns the previous action for SIGALARM. For the callable service, see sigaction (BPX1SIA, BPX4SIA) — Examine or change a signal action. For the data structure, see BPXYSIGH — Signal constants. AMODE 31 callers use BPX1SIA (sigaction) example.

                                              
         XC    NEWMASK,NEWMASK       Don't block additional signals     
         LA    R15,NCATCHER          New catcher (NCATCHER=0,1  ->)     
         STG   R15,NEWHANDL                                             
         LA    R15,OCATCHER          Old catcher (NCATCHER=0,1  ->)     
         STG   R15,OLDHANDL                                             
         SPACE ,                                                        
         CALL  BPX4SIA,              Examine or change signal action   +
               (=A(SIGALRM#),        Input: Signal constant   BPXYSIGH +
               NEWHANDL,             Input: 0, ->0, ->1 or ->catcher   +
               NEWMASK,              Input: 64Bit mask of signals      +
               =A(0),                Input: Action, BPXYSIGH           +
               OLDHANDL,             0, ->XL4 (return 0, 1 ->catcher)  +
               OLDMASK,              64 bit mask of signals            +
               OLDFLAGS,             Action, BPXYSIGH                  +
               =AD(0),               Data passed to signal routine     +
               RETVAL,               Return value: 0 or -1             +
               RETCODE,              Return code                       +
               RSNCODE),             Reason code                       +
               MF=(E,PLIST)          ----------------------------------